Lightroom: Save book missing -- sort of

Help! I'm in Lightroom 4.3, and I just lost my book. I know it's in there somewhere because the images in the filmstrip that are in the invisible book still have the overlay numbers on them showing how many times they appear in the book. But the book module shows only empty pages. I had saved my book as a Book Collection, and I'm in that collection. I never (knowingly) used multi-colored text in the same caption. All I did was change the filter so I could use some pictures from another collection in my book, and when I clicked back on my Book Collection, the pages were all gone. I tried quitting and restarting as suggested above, but that didn't fix anything. Please help. This is awful.

Please see the attached screenshot. The blue circle and the red circle are contradictory. If there are images that are in my book layout (red circle), why is the layout empty?